温度影响下箔片动压止推轴承分析  

Analysis for Hydrodynamic Foil Thrust Bearings Considering Temperature Effects

作　　者：陈汝刚[1] 陈韬[1,2] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]上海电气电站设备有限公司上海汽轮机厂,上海200240

出　　处：《西安交通大学学报》2014年第11期32-36,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51076129);中央高校基本科研业务费专项资金资助项目(SYSPZ2011030)

摘　　要：为了探讨高温、高转速透平机械中影响箔片轴承性能的温度及气膜压力场分布等因素,对以弹性支撑结构刚度为常数的箔片动压止推轴承建立了雷诺方程和能量方程,并对轴承内部的气流速度进行了分析;通过将气膜的温度、压力以及箔片的变形进行流固热多场耦合,采用有限差分法进行数值计算,得出了内部气膜温度和压力分布,由此分析了轴承结构刚度和轴承数的变化,以及气膜压力、温度和承载力的变化趋势。研究结果表明:支撑结构刚度增大,轴承间气膜的平均压力减小,平均温度上升;轴承数增大,气膜的平均压力和温度升高。设计气体轴承时弹性支承结构的刚度与转子的转速应予以考虑。To investigate the influences of pressure and temperature distribution of gas film on the performance of foil bearings applied to turbomachineries at high temperature and speed, the Reynolds equation and the energy equation are established for a hydrodynamic foil bearing with constant stiffness of structural support, and gas velocity in the bearing is analyzed. Coupling the fields of temperature, pressure and deformation of top foil, finite difference method （FDM） is adopted to solve the equations, and pressure and temperature distribution of gas film are obtained. In the analysis, the variation tendency of pressure and temperature of gas is obtained with the changed dimensionless stiffness of support structure and hearing number. It is found that when the dimensionless stiffness of the support structure increases, the gas pressure decreases, however, the gas temperature behaves oppositely, and when the bearing number increases, the pressure and temperature of gas increase, thus the dimensionless stiffness of support structure and bearing number ought to be taken into account in gas foil bearing designing.

关 键 词：动压 气体轴承 有限差分法 温度 刚度 

分 类 号：TH117.21[机械工程—机械设计及理论]